JPS6229769A - Hydraulic power generating device - Google Patents

Abstract

PURPOSE:To enable a device to adjust rolling in right and left directions, by providing a gliding plate, tiling diagonally downward in the flow direction of water and sinking in the water, as a buoyancy mechanism in the supporting part of water turbines while forming said gliding plate offsettable in the rotary shaft direction of the water turbines. CONSTITUTION:A tightening band 18 is loosened, and if a device adjusts the rotary position of an inner pipe 16 for an outer pipe 17, a gliding plate 10 is turned in the direction of an arrow head B enabling a tilt angle to be adjusted for a water surface W. While the device, if it adjusts the position in the axial direction of the inner pipe 16 for the outer pipe 17, enables the gliding plate 10 to be offset in the direction of an arrow head C in the drawing. The offset adjustment of said gliding plate 10 can suppress rolling in right and left directions of water turbines 6 and a waterfoil 9 generated on the basis of a change of antitorque of a generator 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a hydroelectric power generation device that generates power with a water wheel using water flow from a river or the like.

[Prior art]

The present inventors previously proposed in Japanese Patent Application No. 59-140125 a hydroelectric power generation device that generates electricity using a water wheel suspended in a water stream. This hydroelectric power generation device can be used even in shallow rivers because the water turbine is in a floating state, and it is equipped with an offshore mechanism that also serves as a float to cancel out the counter torque of the generator, so the power generation device can be placed on shore. It has the advantage of being able to automatically move to the center of the river while the river is moving.

By the way, when a water wheel is placed in a floating state as described above, if the rotating shaft is submerged below the water surface, the water flow flowing below the rotating shaft and the water flow flowing above the rotating shaft create rotational forces in opposite directions on the water wheel. This reduces the efficiency of using water flow energy. For this reason, it is best for a water wheel to be as light as possible and have high buoyancy, but since a generator is connected to the water wheel, in order to obtain high buoyancy under these conditions, the water wheel itself should be made of foam material. , countermeasures such as creating a hollow structure will become necessary. However, in the case of such foamed materials and hollow structures, there is a problem in that the selection of materials and structures is restricted because it is necessary to consider the relationship with structural strength.

Further, when the generator is moved from the shore to the center of the river by the offshore mechanism, the rotation speed of the generator gradually becomes faster as it moves from the shore where the water flow is smaller to the center of the river where the water flow is faster. However, the counter torque generated by the generator does not change linearly from high torque in the low rotation range to low torque in the high rotation range, but has the characteristic that it suddenly decreases after a certain rotation speed. For this reason, the lift force caused by the float of the off-shore mechanism and the counter torque of the generator, which were balanced on the shore, are not balanced at the center of the river, causing the turbine to roll left and right, which may reduce the efficiency of using water flow energy.

[Purpose of the invention]

An object of the present invention is to provide a hydroelectric power generation device that can provide a large buoyancy regardless of the material of the water turbine and maintain a stable attitude of the water turbine, thereby increasing the efficiency of using water flow energy.

[Structure of the invention]

The present invention achieves the above object by installing a sliding plate as a buoyancy mechanism, which is inclined diagonally downward in the direction of water flow and immersed in the water, on the supporting part of a freely floating water turbine connected to a generator. can be freely offset in the direction of the rotational axis of the water turbine, and is provided on the front end side of a rod extending upstream from the water turbine, and has a component force in a direction that cancels out the counter torque of the generator and a component force in a direction that crosses the water flow. It is characterized by being equipped with a hydrofoil that generates a lift force having a force of.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a state in which the power generating apparatus according to the embodiment of the present invention shown in FIGS. 2 to 4 is moored in a river. In this Figure 1, 1 is a river where water flows in the direction of arrow A, 2, 3
are the right bank and the left bank, and 4 is a floating hydroelectric power generation device according to the present invention.

The hydroelectric power generation device 4 is moored to the right bank 2 via a lobe 11 in this example.

As shown in FIGS. 2 to 4, the hydraulic power generation device 4 has a generator 5 and a pair of water turbines 6.6 for driving the generator 5 attached to both left and right sides. In the generator 5, a stake (not shown) is fixed to the inside of a casing 7 that forms an outer stationary part, and rotating wheels 6a, 6 of the water turbines 6, 6 are mounted inside the casing 7.
A rotor (not shown) connected to a is installed inside. This casing 7 also serves as a support for the water turbine 6.6, and a rod 8 is fixed to its front end so as to extend upstream. A hydrofoil 9 is attached to the front end of this rod 8 at a lateral position on the right bank 2 side. Further, a sliding plate 10 is attached to the fixed side of the casing 7 so as to be inclined diagonally downward in the water flow direction and sunk.

As will be described later, the hydrofoil 9 generates a vertical lift component to cancel out the counter torque of the generator 4 and a horizontal lift component to float toward the center of the water. 6 and the generator 5 are made to float.

As shown in FIGS. 5 and 6, the water turbine 6 has eight unit blades 2 molded from foamed resin such as expanded polystyrene.
1. ...------, assembled from 21. 8
unit blades 21. ..., 21 is held on the rotating shaft 6a by aluminum cone-shaped holding plates 22, 23 at both ends, and is held while tightening one holding tab 23 in the axial direction with a nut 24. It is fixed by pressing. Because of this tightening,
One presser plate 22 is fixed to the rotating shaft 6a by a pin 25 so as not to move, but the other presser plate 23 is locked to the bottle 26 through a long hole 27 so that it can move in the axial direction. has been done. When the blades of the water turbine 6 are configured with a plurality of unit blades 21, -------, 21 in this way,
Even if a part of the blade is damaged, it is only necessary to replace the damaged unit blade 21, so maintenance can be performed economically.

As shown in FIG. 7, the hydrofoil 9 is formed in a chevron shape such that the right wing 9a and the left wing 9b are concave downward. That is, it is attached so as to be located on the right bank 2 side where it is moored. At this attachment part, a pipe 13 is welded to the stay 12, and the pipe 13 is inserted into the rod 8 and fixed with a tightening band 15.15. Slits 14, 14 are cut into both ends of the pipe 13 to give it appropriate flexibility, and by tightening this portion with a tightening band 15, firm fixation can be achieved. Furthermore, by shifting the position of the pipe 13 relative to the rod 8 in the rotational direction, the mounting angle θ of the stay 12 with respect to the horizontal direction can be adjusted steplessly.

As shown in FIG. 8, the hydrofoil 9 submerged in the water is
Based on the lift force LI+L2 generated on the left wing 9b and the lift force LI+L2, the lift force is transmitted to the attachment part of the rod 8. The vertical component force Lu cancels out and balances the counter torque generated by the rotation of the generator 5, that is, the counter torque that pushes down the front end side of the rod 8, and the horizontal component force L
s is the force that forces the water to cross the water at right angles to the center of the river.

That is, in FIG. 8, the lift force L generated on the right wing 9a
l is separated into a component force L, 1 parallel to the stay 12 and a component force L1 '' perpendicular to this, and the lift force L2 generated on the left wing 9b is divided into a component force L, 1 parallel to the stay 12 and a component force L, 1 that is perpendicular to this. It can be separated into a perpendicular component force L2''.

Therefore, the lifting force applied to the attachment portion of the rod 8 via the stay 12 becomes L=L,°+L2′. If the inclination angle of the stay 12 with respect to the horizontal direction is θ, then the above L
u (!=Ls is expressed by the following formula.

Lu = (Lt' + Lt') sinθLs
= (Lt' + Lz') cos θ As is clear from this equation, by adjusting the mounting angle θ of the stay 12, the component force Lu to cancel the counter torque and the component force Ls to be pushed out to the center can be arbitrarily adjusted. can be adjusted to Further, the opening angle α between the right wing 9a and the left wing 9b can be any angle smaller than 180°, but the stay 12
It is desirable that the size is such that the hydrofoil 9 does not protrude excessively from the water surface W when the mounting angle θ becomes small.

Further, as is clear from the function of the hydrofoil 9 described above, when mooring the hydroelectric power generation device 4 to the left bank 3, the tightening band 15 is loosened and the pipe 13 is rotated to the side opposite to the rod 8. Then, the hydrofoil 9 may be fixed so as to be positioned toward the left bank 2 side.

On the other hand, the sliding plate 10 is immersed in the water diagonally downward with respect to the water flow direction, so that the water flow from upstream can be directed by the arrow A.
This generates a lifting force F that causes the water turbine 6 and the generator 5 to float higher. Due to this floating force F, the rotating shaft 6a of the water turbine 6 is always maintained above the water surface W. Therefore, the sliding plate 10 can provide high buoyancy regardless of the material of the water turbine 6.

In addition, this sliding plate 10 also acts to accelerate the water flow,
The impact force of the water flow that gives rotational force to the water wheel 6 is increased.

This sliding plate 10 has an inner pipe 16 extending from side to side on the upper surface.
and attach a shorter outer pipe 1 to this inner pipe 17.
7 is rotatably and slidably fitted, and the outer pipe 17 can be fixed in position by tightening both ends of the outer pipe 17 with tightening bands 18 and 18. Further, another pipe 19 is welded to the center of the upper surface of the outer pipe 17 so as to intersect with each other, and this pipe 19 can be inserted into the support rod 8. When the pipe 19 is inserted into the rod 8, it can be fixed by tightening both ends with tightening bands 20, 20. The pipes 17 and 19 are both provided with slits at both ends to ensure secure fixation by the tightening bands 18, 20.

Since the mounting structure of the sliding plate 10 is as described above, by loosening the tightening band 18 and adjusting the rotational position of the inner pipe 16 with respect to the outer pipe 17, the sliding plate 10 can be rotated in the direction of arrow B and rotated relative to the water surface W. The tilt angle (angle of attack) can be adjusted. Thereby, the magnitude of the lifting force F generated by the sliding plate 10 that causes the water turbine 6 and the like to float can be adjusted. Furthermore, by adjusting the axial (lateral) position of the inner pipe 16 with respect to the outer pipe 17, the sliding plate 10 can be offset in the direction of arrow C (direction of the rotation axis of the water turbine 6).

This offset of the sliding plate 10 is caused by the fluctuation of the counter torque of the water turbine 6 of the generator 5, as will be explained below.
Also, rolling of the hydrofoil 9 in the left and right direction can be suppressed.

As explained in the [Prior Art] section above, the counter torque of the generator does not change linearly from high torque in the low rotation range to low torque in the high rotation range, but when it exceeds a certain rotation speed. It has the characteristic of rapidly decreasing. For this reason, even if the counter torque of the generator 5 is balanced with the lift of the hydrofoil 9 at the shore where the flow velocity is slow, the lift force of the hydrofoil 9 is greater at the center where the flow velocity is high, and one side of the wing (the right wing 9a ) is the water surface W
It will protrude significantly from the When this happens, the lifting force of the right wing 9a shown in FIG.
This will cause it to roll in the left and right direction.

In this case, if the sliding plate 10 is offset to the 10° position shown by the chain line in FIG. As a result, the lift force on the right half area becomes larger than the lift force on the left half area, so a rolling moment is generated in the opposite direction to the upward direction.

Therefore, by adjusting the offset amount of the sliding plate 10, the rolling moment due to the sliding plate 10 can be balanced with the rolling moment based on the lifting force Lt of the left wing 9b of the hydrofoil 9, and the water turbines 6, 6 can be kept in a horizontal normal state. You will be able to take the posture.

In the embodiment described above, the sliding plate 10 is arranged upstream of the water turbines 6, 6, but as in the embodiment shown in FIGS. It may be arranged downstream of the water turbine 6.6 via the stay 30 fixed as above, and the same effect can be obtained. However, in the case of this downstream arrangement, the water flow accelerated by the sliding plate 10 cannot be applied to the water turbine 6 as in the case of the upstream arrangement.

〔Effect of the invention〕

As described above, the hydroelectric power generation device of the present invention is provided with a sliding plate as a buoyancy mechanism, which is inclined diagonally downward in the direction of water flow and immersed in water, on the support part of a freely floating water turbine connected to a generator. This sliding plate is made to be freely offset in the direction of the rotational axis of the water turbine, and furthermore, on the side of the front end of a rod extended upstream from the water turbine, a component force in a direction that cancels out the counter torque of the generator and crosses the water flow is applied. The configuration is such that a hydrofoil that generates lift with a component force in the direction is attached.
The sliding plates described above can provide a large buoyancy regardless of the material of the water turbine. Furthermore, by making the sliding plate freely offset, the rolling in the left and right directions can be adjusted according to the magnitude of the counter torque of the generator, so a stable water turbine attitude can be maintained. Therefore, it is possible to always use the optimum water flow energy and to improve the energy use efficiency.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the hydroelectric power generation device of the present invention moored in a river, Fig. 2 is a side view of the hydroelectric power generation device according to the embodiment of the present invention, Fig. 3 is a plan view of the same, and Fig. 4 is a front view of the same, Fig. 5 is a view showing the water turbine of the same equipment as seen from the V-V arrow in Fig. 6, Fig. 6 is a view taken from the VI-Vl arrow in Fig. 5, and Fig. 7 is a hydrofoil. Figure 8 is an explanatory diagram of the lift generated on the hydrofoil, Figure 9 is an exploded perspective view of the mounting part of the sliding plate, and Figure 10 is an exploded perspective view of the mounting part of the hydrofoil. FIG. 11 is a side view of the hydraulic power generation device according to the embodiment, FIG. 11 is a plan view thereof, and FIG. 12 is an enlarged perspective view of the sliding plate portion of the device. 5-Generator, 6--Water wheel, 7-Casing (
(support part of water wheel), 8--rod, 9--hydrofoil,
9a-right wing, 9b-left wing, 10-sliding board.

Claims (3)

[Claims] (1) A sliding plate that is tilted diagonally downward in the water flow direction and submerged in the water is provided as a buoyancy mechanism on the supporting part of the floating water turbine connected to the generator, and this sliding plate is installed in the direction of the rotation axis of the water turbine. A lift force having a component force in a direction that cancels out the counter torque of the generator and a component force in a direction that crosses the water flow is generated on the side of the front end of a rod that can be offset freely and further extended upstream from the water turbine. A hydroelectric power generation device characterized by being equipped with hydrofoils. (2) The hydroelectric power generation device according to claim 1, wherein the sliding plate is arranged on the upstream side of the water turbine. (3) The hydroelectric power generation device according to claim 1, wherein the sliding plate is arranged on the downstream side of the water turbine.